Arctic sea ice reached its annual minimum extent on September 12, as reported by NASA and the National Snow and Ice Data Center (NSIDC) at the University of Colorado Boulder. This year's minimum coverage was approximately 1.78 million square miles (4.6 million square kilometers), tying the years 2008, 2010, and 2025 for the 10th-lowest minimum in the satellite record. The 2026 minimum aligns with long-term patterns observed since satellite monitoring began in the late 1970s. Over the past 20 years, from 2007 through 2026, the 20 lowest annual Arctic sea ice minimums have been recorded, showing a consistent decline in ice coverage. Arctic sea ice naturally expands during the cold, dark autumn and winter months and then retreats as temperatures rise in spring and summer, reaching its lowest point in September. However, weather conditions can significantly influence the amount of ice that melts each summer. For instance, increased cloud cover in recent years has limited the amount of solar radiation reaching the ice, slowing the melting process. Linette Boisvert, a sea ice scientist at NASA's Goddard Space Flight Center, explained that this has contributed to relatively stable September ice levels in recent years, even though they remain low compared to earlier decades. At the opposite end of the globe, Antarctic sea ice is nearing its annual maximum after a notable fluctuation in August. During that time, sea ice around Antarctica decreased by approximately 116,000 square miles (300,000 square kilometers) over six days before resuming its seasonal growth. Walt Meier, a senior research scientist at NSIDC, noted that such changes are not uncommon but that the scale of the decline was unusual. Unlike the Arctic, which is surrounded by land, Antarctica's sea ice is more influenced by wind and weather patterns, leading to greater year-to-year variability. Despite this, Antarctic sea ice has generally reached lower maximums in recent years, though scientists are cautious about interpreting these changes as long-term trends. Scientists have been monitoring polar sea ice from space for nearly 50 years. NASA and the National Oceanic and Atmospheric Administration (NOAA) have maintained a continuous record using a series of satellite instruments, starting with NASA's Nimbus-7 satellite in 1978. The record has been continued with data from various satellite programs, and today, the Advanced Microwave Scanning Radiometer 2 (AMSR2) aboard Japan's GCOM-W satellite provides the latest measurements. Antarctic sea ice typically reaches its annual maximum in late September or early October, and the 2026 maximum will be officially announced once scientists confirm that seasonal growth has ended.